Bending machine



G. MAFERA BENDING MACHINE July 22, 1930.

July 22,1930. v@.MAFERA 1,771,051

BENDING MACHINE Filed NOV. 19, 1929 3 Sheets-Sheet 2 N J2: lvez: for

b3 mw Zhi/Lawn@ G. MAFERA BENDING MACHINE July 22, 1930.

3 Sheets-Sheet 3 Filed Nov. 19, 1929 Patented July 22, 1930 GUY MATERA, oF Rnvimiii,` MASSACHUSETTS 'BENDING MACHINE Application iled'NOvem'ber 19, 15929. SelialNO. 4081,228.

This invention relates Vto bending machines, and particularly to a machine for bending to shape the collars used in chain fencing to fasten the Stretcher bars which carry the fence links to the fence posts.

Such collars have heretofore been bent to shape vby hand. Hand methods, however, are slow andiexpensive and it is the general object of my invention to provide a simple,

l efficient and reliable machine for bending these collars more rapidly, accurately and cheaply than is possible with present hand methods. y

This object is secured in the machine of the present invention through the coordinated operations of novel blankV feeding and blank bending mechanisms functioning in properly timed relation to `each other successively to feed and bend the blanks into collars ofthe desired shape or shapes.

In my' machine, the feed 4of the collar blanks to the bending dies is synchronized with the operation of thebending mechanism.

Such mechanism comprises a relativelystationary die and a pair of laterally disposedpivoted dies which are'automatical'ly opened and closed in' properly timed relation to the feed of blanks whereby the blanks are admitted singly to the dies while the dies are :so open, after which the dies are automatically closed to bend the blank to shape, and again opened to permit the bent collar to be discharged from the machine while a new blank is being fed to the opened die. The lateral dies are pivoted on a common pivot which is disposed'in the line of the Vstationary die. These dies are closed by a pair of die closing members `in the form of rolls carried Aby a reciprocable slide, and are opened by a pair'of slotted links connected to said slidey at a common point which is in line with the pivot for the dies.

The blanks descend by gravity along a` blank feed chute andatthe discharge end of the chuteare releasably detained by adetent which yields in the direction of feed of the blanks along said chute. The resistance of the detent is overcome and the endinost blank in the chute is positively ejected past the detent by an ejector operating in a plane transversely across the discharge Aendof the chiite. Suchejector is actiiaatedfin synchronism with the slide for opening .and-:closing the pivoted dies.

a Although particularly adaptediorl bending fencing collars, my machine is notrestricted to such fuse, andthe principles may be `applied V.to the bending of a ywide variety of blanks of sheet` material.

In. the drawings: Y

Fig. 1 is a side elevation, partly insection, of 'a collar-'bending machine` in accordance with my invention.

Fig.'2 is a longitudinal section on the line 2-2 of Fig. 3.

Fig. 3 is a fragmentary plan view with the bending dies shown in their open position.

Fig. Zlis a fragmentary plan View `with rthe bending dies s-hown in' their closed position.

Fig'. 5 is a partial planview' particularly-7o showing the automatic blankfeed.l mechanism. .y Y

Figs..}6uand'7 are sections on the 2line6-6 of Fig; 8 and showing the blank ejector in its ejecting and non-ejecting positions, speetivel-y.`

Fig. 8 isa cross section on the :line f`8-'-8 :of Fig; 4.

Fig. 9 isfa perspective view of one ofthe inishedco'llars bent on mypnia'c'hin'eyand :w80

Figs. 10 and `11 are fragmentar. `details showing bending dies which may e interchanged 'with the dies lshown in theother Iigures of the drawing whereby to bend slightly differentforinsof collars fromftihat illus-*35 tra-ted in Fig. '9.

I haveV indicated .at l a bed or table fandt at 2 avpower shaft which takes its ldrive from any suitable` power source, :as then` driving pulley 3. The shaft 2 is journaled trans-'w90 versely of the bed or table at one end thereof Vinf-suitable bearings, and the drive therefore is applied 'through any suitable clntch'mechanism, indicated generally at 4,.and-stripper lever 5. l e

Fast on `the inner lend ofthe power ishaftQ is a crank "6whichthr`ough a' pitnian' recproca-tes a slide i8 -fbaek and'forthf longitudinally of the bed 1.

The slide 8- is `guided finta channeled-guidewe iii way 9 fixed to the bed 1 and on its forward stroke (Fig. 4) swings a pair of oppositely disposed bending dies 10 inwardly relatively to a fixed die or anvil 11 whereby to bend an interposed collar blank B about said fixed die.

The pivoted dies 10 are pivoted at 12 on a common pivot studand are swung inwardly by a pair of oppositely disposed rollers 13 revolubly mounted on the slide 8 at either side thereof. The outer face of the dies 10 are curved as indicated at 14 to conform to the curvature of the rollers 13, and their inner faces are curved as at 15 to cooperate with the fixed die 11 in imparting to the blank B the desired shape.

Then the slide 8 reaches the limit of its forward stroke, (Fig. 4) the rollers 13 have fully closed the swinging dies 10 about the fixed die 11.

It will be noted that the swinging dies 10 are not only pivoted on a common pivot 12 but that such pivot is located in the line of the fixed die 11 as well as in the line of travel of the reciprocating slide.

On the return stroke of the slide (Fig. 3) the dies 10 are opened. In this movement of the slide, the rollers 13 are withdrawn from their engagement with the dies 10 and said dies are swung outwardly on their pivot 12 by means of a pair of crossed links 16. The links 16 are connected at their rear ends by a common fastening stud 17l to one of the cross members 18 of the slide disposed in the line of the pivot stud 12 and at their forward ends as at 19-19 to the dies 10. The links 16 are longitudinally slotted as at 20 and the anchor stud 17 travels back and forth in said slots, as appears in Figs. 3 and 4 according to the direction of movement of the slide.

When the slide 8 reaches the limit of its rearward stroke (Fig. 3) the links 16 have fully opened the dies 10.

The fixed die or anvil 11 is bolted or otherwise detachably fastened as at 21 over a delivery opening 22 (Figs. 2 and 3) in the bed 1 of the machine through which opening the bent collars discharge into any suitable collection receptacle or conveyor belt (not shown). The die block which carries the stationary die or anvil 11 is indicated at 23 (Fig. 2) and is bolted to the bed of the machine as at 24. The die 11, block 23 and delivery opening 22 may be removably covered by any suitable cap plate 25 (Figs. 1 and 3).

The blanks B are fed by gravity, assisted if desired by a sliding or rolling follower 26, down an inclined feed chute 27 .which is suitably supported on the bed 1, and are discharged singly into the space between the pivoted dies 10, when opened, and the fixed die 11 in properly timed relation to the opening and closing movements of the pivoted dies 10.

To accomplish this, I provide a blank ejector 28 operating across the lower or discharge end of the chute 27. This ejector, as here shown, reciprocates vertically, and is oper-- ated from the same drive shaft 2 which operates the slide 8.

The ejector 28 is guided in suitable guideways 29 (Figs. 6 and 7) at the discharge end of the chute 27 and operates in advance of a stop block or plate 30 mounted on the fixed die 11 between the ejector 28 and the inner edge of the die block 23 (Fig. 2).

The ejector is lowered by means of a cam 31 (Figs. 1 and 3) fast on the power shaft 2 and operating beneath a rocker arm 32. The rocker arm 32 works against the action of a return spring 33 and is fast on a rock shaft 34 which ext-ends transversely across the machine beneath the feed chute. Fast to the rock shaft 34 at either' side of the machine is a rocker arm 35, which is loosely connected at 36 (Fig. 5) to the ends of the ejector 28.

When the ejector is raised to the position shown in Fig. 7, the endmost blank in the feed chute is held against escape from the chute by one or more spring pressed det-ents 37 which project beneath the bottom edge of said blank. The detents 37 operate in suitable slots formed in the stop plate 30 and yield forwardly in the direction of feed of the blanks down the chute when the ejector 28 descends, such descent forcing the endmost blank downwardly into the space between the pivoted dies 10 and the fixed die 11, as clearly shown in Fig. 6 whereupon the detents 37 immediately return to the position Vof Fig. 7 when ,the ejector 28 ascends, thereby to engage and hold from escape the next blank in the chute until the ejector descends 1 aGain.

Dlt will thus be seen that the blanks are successively registered with the eject-,0r Whip,

the ejector is raised but are prevented from escape by the spring detents 37 until posi tively ejected therepast by the descending ejector, and that this operation is synchro- 3,.,

collar shown in Figs. 10 and 11, it is sin'iply necessary to remove the dies 10 and 11 and substitute therefor the corresponding dies shown in Figs. 10 or 11. This may be accomplished with the minimum ease and without disturbing the general adjustment of the machine.

Various modifications in the construction and operation of my device may obviously be resorted to if within the spirit and scope of my invention without departing from the limits of the appended claims.

lVhatI therefore claim and desire to secure byLetters Patent is:

l. In combination, a reciprocable slide, a relatively fixed die, a pair of pivoted dies disposed one on either side of said fixed die, means operated by said slide in one direction of .travel thereof to close the die pair, means operated by said slide in the opposite direction of travel thereof to open said die pair, a blank feed, and a blank ejector operating in timed relation to said slide to deliver blanks successively to said dies when open.

2. In combination, a reciprocable slide, a

relatively fixed die, a pair of pivoted diesl disposed one on either side of said fixed die, a common pivot for said die pair disposed in the line of said fixed die, means operated by said slide in one direction of travel thereof to close the die pair, means operated by said slide in the opposite direction of travel thereof to open saiddiepair, a blank feed, and av blank ejector operating in timed relation to said slide to deliver blanks successively to said dies when open.

3. In combination, a reciprocable slide, a relatively fiXed die, a pair of pivoted dies disposed one-on either Vside of said fiXed die, a revoluble roller carried by said slide at either side of said die pair and active` on said dies in one direction of travel of the slide to close the same, means Voperated by said slide `in the opposite direction of travel thereof to open said die pair, a blank feed, and a blank ejector operating in timed v'relation to said slide to deliver; blanks'successively to said dies when open.

4L. In combination, a reciprocableslide, a relatively fixed die, a pair of pivoted dies disposed one on either side of said fixed die, a revoluble roller carried by said-slide at either side of said die pair and active on said dies in one direction of travel of the slide to close the same, means operated by said slide in the opposite direction of travel thereof to open said die pair, and comprising a pair of slotted links crossed upon each other and fastened at one end to said die pair, and a "stud set through the slots of said links and through said slide, a blank feed, and a blank ejector operating in timed relation to said slide to deliver blanks successively to said dies when open.

5. In combination, a reciprocable slide, a relatively stationary die, a pair of pivoted dies disposed one on either side of said stationary die, a pair of die closing members mounted on said slide at either side of said pair of dies and acting on the outer faces of said dies in one direction of travel of the slide to close said dies, means operated by said slide in the opposite direction of travel thereof to open said die pair, a blank feed chute for delivering article blanks singly to said dies, anda blank ejector operating at the discharge end of said chute in timed relation to said slide to deliver blanks successively to said dies when open.

6. In combination, a reciprocable slide, a relatively stationary die, a pair of pivoted dies disposed one on either side of said stationary die, said pair of dies being pivoted on a common pivot and having their inner faces shaped'to conform to the shape of the ultimate article to be bent from the` article blank and having their outer faces curved to receive closing members, a pair of die closing members mounted on said slide at either side of said pair of dies and acting on the outer faces of said dies in one directionl of travel of the slide to close said dies, means operated by said slide in the opposite direction of travel thereof to open said die pair, a blank feed chute for delivering article blanks singly to said dies, and a blank ejector operating at the discharge end of said chute in timed relation to said slide to deliver blanks successive-ly to said dies when open.

7 In combination, a power shaft, a slide reciprocated therefrom, a relatively stationary die and a pair of laterally swinging dies disposed on opposite sides of said stationary die, a pair of die closing members mounted on said slide at either side of said pair of dies and acting on the outer faces of said dies in one direction of travel of the slide to close said dies, a pair of slotted links crossed upon each other and fastened at one end to said slide and at their opposite end each 4to one ofsaid'pivoted dies for opening said die pair upon movement ofthe slide in the opposite direction, a blank feed chute for delivering article blanks singly to said dies, and a blank escapement mechanism operated from lsaid power shaft in timed relation to said slide to v,deliver blanks successively to said dies when open.

8. In combination, a power shaft, a slide reciprocated therefrom, a relatively stationary die and a pair of laterally swinging dies disposed on opposite sides of said stationary die,said pair of dies being pivoted on a common pivot and having their inner faces shaped to conform tothe shape of the ultimate article to be bent from the article blank and having their outer lfaces curved to receive closing members, a pair of die closing members mounted on said slide at either side of said pair of dies and acting on the `outer faces of said dies in one direction of travel of the slide to close said dies, a pair of slotted links crossed upon each other and fastenediat one end to said slide and at their opposite end each to one of said pivoted dies for opening said die pair upon movement of the slide in the opposite direction, a blank feed chute for ldelivering article blanks singly to said dies, and a blank escapement mechanism operated from said power shaft in timed relation to said slide to deliver blanks successively to said dies when open.

9. In combination, a power shaft, a slide reciprocated therefrom, a relatively stationary die and a pair of pivoted dies disposed on opposite sides of said stationary die, a pair of die closing rolls mounted on said slide at either side of said pair of dies and acting on the outer faces of said dies in one direction of travel of the slide to close said dies, and a pair of slotted links crossed upon each other and fastened at one end to said slide by a fastening set through the slots of said links and fastened at their opposite end each yto one of said pivoted dies for opening said die pair upon movement of the slide in the opposite direction.

l0. In combination, a power shaft, a slide reciprocated therefrom, a relatively stationary die and a pair of pivoted dies disposed on opposite sides of said stationary die, means operated by said slide in one direction of travel thereof to close said pair of dies, means operated by said slide in the opposite direction of travel thereof to open said pair of dies, a blank feed chute, an ejector reciprocable across the delivery end of said chute, motion transmitting connections from said power shaft to said ejector for operating said ejector in timed relation to the opening and closing movements of said pivoted die pair, and a yieldable detent normally disposed in the path of said ejector for engagement with the endmost blank in said chute and yieldable upon movement of the ejector in one direction to permit successive ejection therepast of the endmost blank in said chute.

11. In combination, a reciprocable slide, a relatively fixed die, a pair of pivoted dies disposed one on either side of said VfiXed die, a common pivot for said die pair, means operated by said slide in one direction of travel thereof to close the die pair, and means operated by said slide in the opposite direction of travel thereof to open said die pair, and disposed in the line of said common pivot for the die pair.

12. In combination, a power shaft, a slide reciprocated therefrom, die closing means operated by said slide, a pair of pivoted bending dies adapted to be closed thereby, a fixed bending die disposed between said pivoted die pair, a pair of die opening links fastened at their forward ends to said die pair and at their rear ends to said slide, said links being slotted and the fastening which attaches them to said slide being disposed in the slots of the links, a blank feed chute, a stop at the discharge end of said chute including a sprinor detent yielding in the direction of feed of the blanks, and ejector reciprocable across the discharge end of the chute and effective to eject the endmost blank in said chute past said yieldable detent, and motion transmitting connections between said ejector and said power shaft for operating said ejector in timed relation to said slide.

13. In combination, a power shaft, a slide reciprocated therefrom, die closing rolls mounted on said slide, a pair of pivoted bending dies disposed in the path of said rolls, a fixed bending die disposed between said pivoted die pair, die opening means operated by said slide, a blank feed chute, a stop at the discharge end of said chute including a spring detent yielding in the direction of feed of the blanks, an ejector reciprocable across the discharge end of the chute and effective to eject the endmost blank in said chute past said yieldable detent, and motion transmitting connections between said ejector and said power shaft for operating said ejector in timed relation to said slide.

14C. In combination, a power shaft, a slide reciprocated therefrom, die closing rolls mounted on said slide, a pair of pivoted bending dies disposed between said pivoted die pair, a pair of die opening links fastened at their forward ends to said die pair and at their rear ends to said slide, said links being slotted and the fastening which attaches them to said slide being disposed in the slots of the links, a blank feed chute, a stop at the discharge end of said chute including a spring detent yielding in the direction of feed of the blanks, an ejector reciprocable across the discharge end of the chute and effective to eject the endmost blank in said chute past said yieldable detent, and motion transmitting connections between said ejector and said power shaft for operating said ejector in timed relation to the operation of said slide.

In testimony whereof I aiix m signature.

GUY AFERA. 

